[Lowfer] Measuring TX loop current

[rick kirby]

Hi Bill,
Thanks for getting back to me. Yes that would be great if you could work 
that out for me! Does 2 volts AC seem correct across the loop terminals at 
the transmitter ?
 Thanks again,

 Rick


----- Original Message ----- 
From: "Bill Ashlock" <ashlockw at hotmail.com>
To: <lowfer at mailman.qth.net>
Sent: Monday, September 21, 2009 8:24 PM
Subject: [Lowfer] Measuring TX loop current


>
> Rick,
>
>
>
> The following two lines were copied from Lyles clamp-on current probe 
> article: "An ideal ammeter should introduce zero impedance into the 
> circuit it is measuring. This sensor adds a series impedance of less than 
> half an ohm to the circuit under test at 200 kHz". Lyle's probe was 
> designed to be used for measuring vertical antennas where typically half 
> an ohm of series impedance is normally insignificant. Since your loop has 
> an Rac of approx 1 ohm this probe, with the number of turns and resistive 
> load given, would read the loop current approx 30% low. If you would like 
> I can come up with a better choice for these values when measuring your 
> loop.
>
>
>
> Bill
>
>
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